<template>
    <view>
         <!-- 使用自定义的搜索组件 -->
        <my-search ></my-search>
        <view class="scrooll-view-container">
            <!-- 左侧的滑动区域  -->
            <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" >
                <block v-for="(item , i) in cateList" :key="i" >
                    <view @click ="activeChanged(i)" :class="['left-scroll-view-item',i === active ? 'active' : '']">{{item.cat_name}}</view>
                </block>
            </scroll-view>
            <!-- 右侧的滑动区域 -->
            <scroll-view scroll-y="true" :style="{height: wh + 'px'} " :scroll-top="scrollTop">
                <!-- 二级分类的标题 --> 
                <view class="cte-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
                    <view class="cate-lv2-title" v-if="item2.children">{{item2.cat_name}}</view> 
                    <!-- 动态渲染三级分类的列表数据 -->
                    <view class="cate-lv3-list">
                        <!-- 三级分类的item项 -->
                        <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                            <!-- 三级分类的图片 -->
                            <image :src="item3.cat_icon.replace('ugo-dev','hmugo-web')"></image>
                            <!-- 三级分类的文本 -->
                            <text>{{item3.cat_name}}</text>
                        </view>
                    </view>
                </view>
            </scroll-view>
        </view>
    </view>
</template>

<script>
    import badgeMix from '@/mixins/tabbar-badge.js'
    export default {
        mixins:[badgeMix],
        data() {
            return {
                // 当前设备可用的高度
                wh:0.,
                cateList:[],
                // 二级分类的列表
                cateLevel2:[],
                active: 0,
                scrollTop: 0
            };
        },
        onLoad(){
            const sysInfo = uni.getSystemInfoSync()
            this.wh = sysInfo.windowHeight
            this.getCateList()
        },
        methods:{
            async getCateList(){
                const {data:res } = await uni.$http.get('/api/public/v1/categories')
                if(res.meta.status !== 200) return uni.$showMsg()
                this.cateList = res.message
                
                // 为二级分类赋值
                this.cateLevel2 = res.message[0].children
            },
            activeChanged(i){
                this.active = i
                // 重新为二级分类赋值
                this.cateLevel2 =  this.cateList[i].children
                    
                this.scrollTop = Math.random()
            },
            gotoGoodsList(item){
                // 跳转到商品列表页面
                uni.navigateTo({
                    url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
                })
            },
        }
    }
</script>

<style lang="scss">
.scrooll-view-container {
    display: flex;
}
.left-scroll-view {
    width: 120px;
}
    
.left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px; 
        
            
        &.active{
            background-color: #FFF;
            position: relative;
                
            &::before {
                content: ' ';
                display: block;
                width: 3px;
                height: 30px;
                background-color: #c00000;
                position: absolute;
                top:50%;
                left:0;
                transform: translateY(-50%);
            }
        }
        
        
        
}

.cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0
}

.cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item {
        width: 33.33%;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin-bottom: 10px;
        
        
        image { 
            width:60px;
            height: 60px;
        }
        text {
            font-size: 12px;
        }
        
    }
}
</style>
